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}})()</script><meta name="generator" content="Hexo 5.3.0"></head><body><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="author-avatar"><img class="avatar-img" src="http://q1.qlogo.cn/g?b=qq&amp;nk=153669225&amp;s=100" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/blog/archives/"><div class="headline">文章</div><div class="length-num">33</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/blog/tags/"><div class="headline">标签</div><div class="length-num">18</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/blog/categories/"><div class="headline">分类</div><div class="length-num">5</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/blog/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/blog/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/blog/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/blog/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/blog/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div></div></div><div id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url(/blog/img/postimg/21-1-6-week19.png)"><nav id="nav"><span id="blog_name"><a id="site-name" href="/blog/">Danyhug's Blog</a></span><div id="menus"><div class="menus_items"><div class="menus_item"><a class="site-page" href="/blog/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/blog/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/blog/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/blog/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/blog/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">第十九周 | Easy PHP</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-01-06T13:16:37.000Z" title="发表于 2021-01-06 21:16:37">2021-01-06</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-01-06T13:56:43.665Z" title="更新于 2021-01-06 21:56:43">2021-01-06</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/blog/categories/CTF/">CTF</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-pv-cv"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><blockquote>
<p>简单的变量覆盖题</p>
</blockquote>
<ol>
<li><p>打开链接，直接一堆代码</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"></span><br><span class="line">highlight_file(<span class="string">&#x27;source.txt&#x27;</span>);</span><br><span class="line"><span class="keyword">echo</span> <span class="string">&quot;&lt;br&gt;&lt;br&gt;&quot;</span>;</span><br><span class="line"></span><br><span class="line"><span class="variable">$flag</span> = <span class="string">&#x27;xxxxxxxx&#x27;</span>;</span><br><span class="line"><span class="variable">$msg_giveme</span> = <span class="string">&#x27;Give me the flag!&#x27;</span>;</span><br><span class="line"><span class="variable">$msg_getout</span> = <span class="string">&#x27;No this. Get out!&#x27;</span>;</span><br><span class="line"><span class="keyword">if</span>(!<span class="keyword">isset</span>(<span class="variable">$_GET</span>[<span class="string">&#x27;flag&#x27;</span>]) &amp;&amp; !<span class="keyword">isset</span>(<span class="variable">$_POST</span>[<span class="string">&#x27;flag&#x27;</span>]))&#123;</span><br><span class="line">    <span class="keyword">exit</span>(<span class="variable">$msg_giveme</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span>(<span class="variable">$_POST</span>[<span class="string">&#x27;flag&#x27;</span>] === <span class="string">&#x27;flag&#x27;</span> || <span class="variable">$_GET</span>[<span class="string">&#x27;flag&#x27;</span>] === <span class="string">&#x27;flag&#x27;</span>)&#123;</span><br><span class="line">    <span class="keyword">exit</span>(<span class="variable">$msg_getout</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">foreach</span> (<span class="variable">$_POST</span> <span class="keyword">as</span> <span class="variable">$key</span> =&gt; <span class="variable">$value</span>) &#123;</span><br><span class="line">    <span class="variable">$$key</span> = <span class="variable">$value</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">foreach</span> (<span class="variable">$_GET</span> <span class="keyword">as</span> <span class="variable">$key</span> =&gt; <span class="variable">$value</span>) &#123;</span><br><span class="line">    <span class="variable">$$key</span> = <span class="variable">$$value</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">echo</span> <span class="string">&#x27;the flag is : &#x27;</span> . <span class="variable">$flag</span>;</span><br><span class="line"></span><br><span class="line"><span class="meta">?&gt;</span></span><br></pre></td></tr></table></figure></li>
<li><p>分析代码</p>
<ol>
<li>判断GET请求的参数flag和POST的参数flag是否存在，都存在即退出</li>
<li>判断GET和POST的参数是否都为flag，如果都不是退出</li>
<li>如果GET和POST的参数flag的值有一个为flag，退出</li>
<li>键值对赋值，POST方式赋值确定的值，GET方式赋值变量的值</li>
<li>输出flag</li>
</ol>
</li>
<li><p>首先GET给定参数flag，将flag的值给1，会输出the flag is : ，因为1不是一个变量，所以输出空，因此可以将flag的值先赋值flagT，然后在将flag的值改为flagT，即?flagT=flag&amp;flag=flagT</p>
</li>
<li><p>flag{asdhetianlab}</p>
</li>
</ol>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">Danyhug</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="http://danyhug.gitee.io/blog/2021/01/06/%E7%AC%AC%E5%8D%81%E4%B9%9D%E5%91%A8-Easy-PHP/">http://danyhug.gitee.io/blog/2021/01/06/第十九周-Easy-PHP/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="http://danyhug.gitee.io/blog" target="_blank">Danyhug's Blog</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/blog/tags/%E4%BF%A1%E6%81%AF%E5%AE%89%E5%85%A8/">信息安全</a><a class="post-meta__tags" 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